chore(main): release 1.73.0-SNAPSHOT #15338

Job	Run time
root-pom	1m 26s
gapic-bom	1m 25s
generate-readme	1m 4s
owlbot-py	56s
group_id_check_for_maps_libraries	7m 4s
package_name_check	48s
owlbot-yaml	59s
gitignore_correctness	48s
	14m 30s

Provide feedback